It's a interesting and pretty fun game! The liked how you used the rewind ideia, and how you mixed the platformer and fps concept. Also, the sounds effects were pretty good!
The only problems that i found was that (1) sometimes the jump doesn't work really well, making me fall and restart the level. And (2) in the closed hall level, some enemies didn't seen to react right to bullets.
But, it's still a great submission! With more time and polishment, this could turn into a big and awesome game!
Congrats! :D